bug#49959: 28.0.50; Emacs got quasi freeze

[martin rudalics]

> Maybe the problem can be summarized as follows:
>
> - Emacs is in a state where a frame is hidden but not iconified.
>
> - Emacs gets a PropertyNotify event but does not react because the frame
>    was in its understanding _not_ iconified before.  Elightenment thinks
>    that Emacs should understand that the frame is visible now and react
>    properly.
>
> If that's the case, then Emacs had this problem ever since.  Actually,
> Emacs here waits for a MapNotify event to arrive but apparently this
> does not happen with Elightenment.

A preliminary patch based on the above remarks is attached.

martin

deiconify.diff
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